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28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 //
30 // Macros and functions for implementing parameterized tests
31 // in Google C++ Testing and Mocking Framework (Google Test)
32 //
33 // GOOGLETEST_CM0001 DO NOT DELETE
34 #ifndef GOOGLETEST_INCLUDE_GTEST_GTEST_PARAM_TEST_H_
35 #define GOOGLETEST_INCLUDE_GTEST_GTEST_PARAM_TEST_H_
36
37 // Value-parameterized tests allow you to test your code with different
38 // parameters without writing multiple copies of the same test.
39 //
40 // Here is how you use value-parameterized tests:
41
42 #if 0
43
44 // To write value-parameterized tests, first you should define a fixture
45 // class. It is usually derived from testing::TestWithParam<T> (see below for
46 // another inheritance scheme that's sometimes useful in more complicated
47 // class hierarchies), where the type of your parameter values.
48 // TestWithParam<T> is itself derived from testing::Test. T can be any
49 // copyable type. If it's a raw pointer, you are responsible for managing the
50 // lifespan of the pointed values.
51
52 class FooTest : public ::testing::TestWithParam<const char*> {
53 // You can implement all the usual class fixture members here.
54 };
55
56 // Then, use the TEST_P macro to define as many parameterized tests
57 // for this fixture as you want. The _P suffix is for "parameterized"
58 // or "pattern", whichever you prefer to think.
59
60 TEST_P(FooTest, DoesBlah) {
61 // Inside a test, access the test parameter with the GetParam() method
62 // of the TestWithParam<T> class:
63 EXPECT_TRUE(foo.Blah(GetParam()));
64 ...
65 }
66
67 TEST_P(FooTest, HasBlahBlah) {
68 ...
69 }
70
71 // Finally, you can use INSTANTIATE_TEST_SUITE_P to instantiate the test
72 // case with any set of parameters you want. Google Test defines a number
73 // of functions for generating test parameters. They return what we call
74 // (surprise!) parameter generators. Here is a summary of them, which
75 // are all in the testing namespace:
76 //
77 //
78 // Range(begin, end [, step]) - Yields values {begin, begin+step,
79 // begin+step+step, ...}. The values do not
80 // include end. step defaults to 1.
81 // Values(v1, v2, ..., vN) - Yields values {v1, v2, ..., vN}.
82 // ValuesIn(container) - Yields values from a C-style array, an STL
83 // ValuesIn(begin,end) container, or an iterator range [begin, end).
84 // Bool() - Yields sequence {false, true}.
85 // Combine(g1, g2, ..., gN) - Yields all combinations (the Cartesian product
86 // for the math savvy) of the values generated
87 // by the N generators.
88 //
89 // For more details, see comments at the definitions of these functions below
90 // in this file.
91 //
92 // The following statement will instantiate tests from the FooTest test suite
93 // each with parameter values "meeny", "miny", and "moe".
94
95 INSTANTIATE_TEST_SUITE_P(InstantiationName,
96 FooTest,
97 Values("meeny", "miny", "moe"));
98
99 // To distinguish different instances of the pattern, (yes, you
100 // can instantiate it more than once) the first argument to the
101 // INSTANTIATE_TEST_SUITE_P macro is a prefix that will be added to the
102 // actual test suite name. Remember to pick unique prefixes for different
103 // instantiations. The tests from the instantiation above will have
104 // these names:
105 //
106 // * InstantiationName/FooTest.DoesBlah/0 for "meeny"
107 // * InstantiationName/FooTest.DoesBlah/1 for "miny"
108 // * InstantiationName/FooTest.DoesBlah/2 for "moe"
109 // * InstantiationName/FooTest.HasBlahBlah/0 for "meeny"
110 // * InstantiationName/FooTest.HasBlahBlah/1 for "miny"
111 // * InstantiationName/FooTest.HasBlahBlah/2 for "moe"
112 //
113 // You can use these names in --gtest_filter.
114 //
115 // This statement will instantiate all tests from FooTest again, each
116 // with parameter values "cat" and "dog":
117
118 const char* pets[] = {"cat", "dog"};
119 INSTANTIATE_TEST_SUITE_P(AnotherInstantiationName, FooTest, ValuesIn(pets));
120
121 // The tests from the instantiation above will have these names:
122 //
123 // * AnotherInstantiationName/FooTest.DoesBlah/0 for "cat"
124 // * AnotherInstantiationName/FooTest.DoesBlah/1 for "dog"
125 // * AnotherInstantiationName/FooTest.HasBlahBlah/0 for "cat"
126 // * AnotherInstantiationName/FooTest.HasBlahBlah/1 for "dog"
127 //
128 // Please note that INSTANTIATE_TEST_SUITE_P will instantiate all tests
129 // in the given test suite, whether their definitions come before or
130 // AFTER the INSTANTIATE_TEST_SUITE_P statement.
131 //
132 // Please also note that generator expressions (including parameters to the
133 // generators) are evaluated in InitGoogleTest(), after main() has started.
134 // This allows the user on one hand, to adjust generator parameters in order
135 // to dynamically determine a set of tests to run and on the other hand,
136 // give the user a chance to inspect the generated tests with Google Test
137 // reflection API before RUN_ALL_TESTS() is executed.
138 //
139 // You can see samples/sample7_unittest.cc and samples/sample8_unittest.cc
140 // for more examples.
141 //
142 // In the future, we plan to publish the API for defining new parameter
143 // generators. But for now this interface remains part of the internal
144 // implementation and is subject to change.
145 //
146 //
147 // A parameterized test fixture must be derived from testing::Test and from
148 // testing::WithParamInterface<T>, where T is the type of the parameter
149 // values. Inheriting from TestWithParam<T> satisfies that requirement because
150 // TestWithParam<T> inherits from both Test and WithParamInterface. In more
151 // complicated hierarchies, however, it is occasionally useful to inherit
152 // separately from Test and WithParamInterface. For example:
153
154 class BaseTest : public ::testing::Test {
155 // You can inherit all the usual members for a non-parameterized test
156 // fixture here.
157 };
158
159 class DerivedTest : public BaseTest, public ::testing::WithParamInterface<int> {
160 // The usual test fixture members go here too.
161 };
162
163 TEST_F(BaseTest, HasFoo) {
164 // This is an ordinary non-parameterized test.
165 }
166
167 TEST_P(DerivedTest, DoesBlah) {
168 // GetParam works just the same here as if you inherit from TestWithParam.
169 EXPECT_TRUE(foo.Blah(GetParam()));
170 }
171
172 #endif // 0
173
174 #include <iterator>
175 #include <utility>
176
177 #include "gtest/internal/gtest-internal.h"
178 #include "gtest/internal/gtest-param-util.h"
179 #include "gtest/internal/gtest-port.h"
180
181 namespace testing {
182
183 // Functions producing parameter generators.
184 //
185 // Google Test uses these generators to produce parameters for value-
186 // parameterized tests. When a parameterized test suite is instantiated
187 // with a particular generator, Google Test creates and runs tests
188 // for each element in the sequence produced by the generator.
189 //
190 // In the following sample, tests from test suite FooTest are instantiated
191 // each three times with parameter values 3, 5, and 8:
192 //
193 // class FooTest : public TestWithParam<int> { ... };
194 //
195 // TEST_P(FooTest, TestThis) {
196 // }
197 // TEST_P(FooTest, TestThat) {
198 // }
199 // INSTANTIATE_TEST_SUITE_P(TestSequence, FooTest, Values(3, 5, 8));
200 //
201
202 // Range() returns generators providing sequences of values in a range.
203 //
204 // Synopsis:
205 // Range(start, end)
206 // - returns a generator producing a sequence of values {start, start+1,
207 // start+2, ..., }.
208 // Range(start, end, step)
209 // - returns a generator producing a sequence of values {start, start+step,
210 // start+step+step, ..., }.
211 // Notes:
212 // * The generated sequences never include end. For example, Range(1, 5)
213 // returns a generator producing a sequence {1, 2, 3, 4}. Range(1, 9, 2)
214 // returns a generator producing {1, 3, 5, 7}.
215 // * start and end must have the same type. That type may be any integral or
216 // floating-point type or a user defined type satisfying these conditions:
217 // * It must be assignable (have operator=() defined).
218 // * It must have operator+() (operator+(int-compatible type) for
219 // two-operand version).
220 // * It must have operator<() defined.
221 // Elements in the resulting sequences will also have that type.
222 // * Condition start < end must be satisfied in order for resulting sequences
223 // to contain any elements.
224 //
225 template <typename T, typename IncrementT>
Range(T start,T end,IncrementT step)226 internal::ParamGenerator<T> Range(T start, T end, IncrementT step) {
227 return internal::ParamGenerator<T>(
228 new internal::RangeGenerator<T, IncrementT>(start, end, step));
229 }
230
231 template <typename T>
Range(T start,T end)232 internal::ParamGenerator<T> Range(T start, T end) {
233 return Range(start, end, 1);
234 }
235
236 // ValuesIn() function allows generation of tests with parameters coming from
237 // a container.
238 //
239 // Synopsis:
240 // ValuesIn(const T (&array)[N])
241 // - returns a generator producing sequences with elements from
242 // a C-style array.
243 // ValuesIn(const Container& container)
244 // - returns a generator producing sequences with elements from
245 // an STL-style container.
246 // ValuesIn(Iterator begin, Iterator end)
247 // - returns a generator producing sequences with elements from
248 // a range [begin, end) defined by a pair of STL-style iterators. These
249 // iterators can also be plain C pointers.
250 //
251 // Please note that ValuesIn copies the values from the containers
252 // passed in and keeps them to generate tests in RUN_ALL_TESTS().
253 //
254 // Examples:
255 //
256 // This instantiates tests from test suite StringTest
257 // each with C-string values of "foo", "bar", and "baz":
258 //
259 // const char* strings[] = {"foo", "bar", "baz"};
260 // INSTANTIATE_TEST_SUITE_P(StringSequence, StringTest, ValuesIn(strings));
261 //
262 // This instantiates tests from test suite StlStringTest
263 // each with STL strings with values "a" and "b":
264 //
265 // ::std::vector< ::std::string> GetParameterStrings() {
266 // ::std::vector< ::std::string> v;
267 // v.push_back("a");
268 // v.push_back("b");
269 // return v;
270 // }
271 //
272 // INSTANTIATE_TEST_SUITE_P(CharSequence,
273 // StlStringTest,
274 // ValuesIn(GetParameterStrings()));
275 //
276 //
277 // This will also instantiate tests from CharTest
278 // each with parameter values 'a' and 'b':
279 //
280 // ::std::list<char> GetParameterChars() {
281 // ::std::list<char> list;
282 // list.push_back('a');
283 // list.push_back('b');
284 // return list;
285 // }
286 // ::std::list<char> l = GetParameterChars();
287 // INSTANTIATE_TEST_SUITE_P(CharSequence2,
288 // CharTest,
289 // ValuesIn(l.begin(), l.end()));
290 //
291 template <typename ForwardIterator>
292 internal::ParamGenerator<
293 typename std::iterator_traits<ForwardIterator>::value_type>
ValuesIn(ForwardIterator begin,ForwardIterator end)294 ValuesIn(ForwardIterator begin, ForwardIterator end) {
295 typedef typename std::iterator_traits<ForwardIterator>::value_type ParamType;
296 return internal::ParamGenerator<ParamType>(
297 new internal::ValuesInIteratorRangeGenerator<ParamType>(begin, end));
298 }
299
300 template <typename T, size_t N>
ValuesIn(const T (& array)[N])301 internal::ParamGenerator<T> ValuesIn(const T (&array)[N]) {
302 return ValuesIn(array, array + N);
303 }
304
305 template <class Container>
ValuesIn(const Container & container)306 internal::ParamGenerator<typename Container::value_type> ValuesIn(
307 const Container& container) {
308 return ValuesIn(container.begin(), container.end());
309 }
310
311 // Values() allows generating tests from explicitly specified list of
312 // parameters.
313 //
314 // Synopsis:
315 // Values(T v1, T v2, ..., T vN)
316 // - returns a generator producing sequences with elements v1, v2, ..., vN.
317 //
318 // For example, this instantiates tests from test suite BarTest each
319 // with values "one", "two", and "three":
320 //
321 // INSTANTIATE_TEST_SUITE_P(NumSequence,
322 // BarTest,
323 // Values("one", "two", "three"));
324 //
325 // This instantiates tests from test suite BazTest each with values 1, 2, 3.5.
326 // The exact type of values will depend on the type of parameter in BazTest.
327 //
328 // INSTANTIATE_TEST_SUITE_P(FloatingNumbers, BazTest, Values(1, 2, 3.5));
329 //
330 //
331 template <typename... T>
Values(T...v)332 internal::ValueArray<T...> Values(T... v) {
333 return internal::ValueArray<T...>(std::move(v)...);
334 }
335
336 // Bool() allows generating tests with parameters in a set of (false, true).
337 //
338 // Synopsis:
339 // Bool()
340 // - returns a generator producing sequences with elements {false, true}.
341 //
342 // It is useful when testing code that depends on Boolean flags. Combinations
343 // of multiple flags can be tested when several Bool()'s are combined using
344 // Combine() function.
345 //
346 // In the following example all tests in the test suite FlagDependentTest
347 // will be instantiated twice with parameters false and true.
348 //
349 // class FlagDependentTest : public testing::TestWithParam<bool> {
350 // virtual void SetUp() {
351 // external_flag = GetParam();
352 // }
353 // }
354 // INSTANTIATE_TEST_SUITE_P(BoolSequence, FlagDependentTest, Bool());
355 //
Bool()356 inline internal::ParamGenerator<bool> Bool() {
357 return Values(false, true);
358 }
359
360 // Combine() allows the user to combine two or more sequences to produce
361 // values of a Cartesian product of those sequences' elements.
362 //
363 // Synopsis:
364 // Combine(gen1, gen2, ..., genN)
365 // - returns a generator producing sequences with elements coming from
366 // the Cartesian product of elements from the sequences generated by
367 // gen1, gen2, ..., genN. The sequence elements will have a type of
368 // std::tuple<T1, T2, ..., TN> where T1, T2, ..., TN are the types
369 // of elements from sequences produces by gen1, gen2, ..., genN.
370 //
371 // Example:
372 //
373 // This will instantiate tests in test suite AnimalTest each one with
374 // the parameter values tuple("cat", BLACK), tuple("cat", WHITE),
375 // tuple("dog", BLACK), and tuple("dog", WHITE):
376 //
377 // enum Color { BLACK, GRAY, WHITE };
378 // class AnimalTest
379 // : public testing::TestWithParam<std::tuple<const char*, Color> > {...};
380 //
381 // TEST_P(AnimalTest, AnimalLooksNice) {...}
382 //
383 // INSTANTIATE_TEST_SUITE_P(AnimalVariations, AnimalTest,
384 // Combine(Values("cat", "dog"),
385 // Values(BLACK, WHITE)));
386 //
387 // This will instantiate tests in FlagDependentTest with all variations of two
388 // Boolean flags:
389 //
390 // class FlagDependentTest
391 // : public testing::TestWithParam<std::tuple<bool, bool> > {
392 // virtual void SetUp() {
393 // // Assigns external_flag_1 and external_flag_2 values from the tuple.
394 // std::tie(external_flag_1, external_flag_2) = GetParam();
395 // }
396 // };
397 //
398 // TEST_P(FlagDependentTest, TestFeature1) {
399 // // Test your code using external_flag_1 and external_flag_2 here.
400 // }
401 // INSTANTIATE_TEST_SUITE_P(TwoBoolSequence, FlagDependentTest,
402 // Combine(Bool(), Bool()));
403 //
404 template <typename... Generator>
Combine(const Generator &...g)405 internal::CartesianProductHolder<Generator...> Combine(const Generator&... g) {
406 return internal::CartesianProductHolder<Generator...>(g...);
407 }
408
409 #define TEST_P(test_suite_name, test_name) \
410 class GTEST_TEST_CLASS_NAME_(test_suite_name, test_name) \
411 : public test_suite_name { \
412 public: \
413 GTEST_TEST_CLASS_NAME_(test_suite_name, test_name)() {} \
414 void TestBody() override; \
415 \
416 private: \
417 static int AddToRegistry() { \
418 ::testing::UnitTest::GetInstance() \
419 ->parameterized_test_registry() \
420 .GetTestSuitePatternHolder<test_suite_name>( \
421 GTEST_STRINGIFY_(test_suite_name), \
422 ::testing::internal::CodeLocation(__FILE__, __LINE__)) \
423 ->AddTestPattern( \
424 GTEST_STRINGIFY_(test_suite_name), GTEST_STRINGIFY_(test_name), \
425 new ::testing::internal::TestMetaFactory<GTEST_TEST_CLASS_NAME_( \
426 test_suite_name, test_name)>(), \
427 ::testing::internal::CodeLocation(__FILE__, __LINE__)); \
428 return 0; \
429 } \
430 static int gtest_registering_dummy_ GTEST_ATTRIBUTE_UNUSED_; \
431 GTEST_DISALLOW_COPY_AND_ASSIGN_(GTEST_TEST_CLASS_NAME_(test_suite_name, \
432 test_name)); \
433 }; \
434 int GTEST_TEST_CLASS_NAME_(test_suite_name, \
435 test_name)::gtest_registering_dummy_ = \
436 GTEST_TEST_CLASS_NAME_(test_suite_name, test_name)::AddToRegistry(); \
437 void GTEST_TEST_CLASS_NAME_(test_suite_name, test_name)::TestBody()
438
439 // The last argument to INSTANTIATE_TEST_SUITE_P allows the user to specify
440 // generator and an optional function or functor that generates custom test name
441 // suffixes based on the test parameters. Such a function or functor should
442 // accept one argument of type testing::TestParamInfo<class ParamType>, and
443 // return std::string.
444 //
445 // testing::PrintToStringParamName is a builtin test suffix generator that
446 // returns the value of testing::PrintToString(GetParam()).
447 //
448 // Note: test names must be non-empty, unique, and may only contain ASCII
449 // alphanumeric characters or underscore. Because PrintToString adds quotes
450 // to std::string and C strings, it won't work for these types.
451
452 #define GTEST_EXPAND_(arg) arg
453 #define GTEST_GET_FIRST_(first, ...) first
454 #define GTEST_GET_SECOND_(first, second, ...) second
455
456 #define INSTANTIATE_TEST_SUITE_P(prefix, test_suite_name, ...) \
457 static ::testing::internal::ParamGenerator<test_suite_name::ParamType> \
458 gtest_##prefix##test_suite_name##_EvalGenerator_() { \
459 return GTEST_EXPAND_(GTEST_GET_FIRST_(__VA_ARGS__, DUMMY_PARAM_)); \
460 } \
461 static ::std::string gtest_##prefix##test_suite_name##_EvalGenerateName_( \
462 const ::testing::TestParamInfo<test_suite_name::ParamType>& info) { \
463 if (::testing::internal::AlwaysFalse()) { \
464 ::testing::internal::TestNotEmpty(GTEST_EXPAND_(GTEST_GET_SECOND_( \
465 __VA_ARGS__, \
466 ::testing::internal::DefaultParamName<test_suite_name::ParamType>, \
467 DUMMY_PARAM_))); \
468 auto t = std::make_tuple(__VA_ARGS__); \
469 static_assert(std::tuple_size<decltype(t)>::value <= 2, \
470 "Too Many Args!"); \
471 } \
472 return ((GTEST_EXPAND_(GTEST_GET_SECOND_( \
473 __VA_ARGS__, \
474 ::testing::internal::DefaultParamName<test_suite_name::ParamType>, \
475 DUMMY_PARAM_))))(info); \
476 } \
477 static int gtest_##prefix##test_suite_name##_dummy_ \
478 GTEST_ATTRIBUTE_UNUSED_ = \
479 ::testing::UnitTest::GetInstance() \
480 ->parameterized_test_registry() \
481 .GetTestSuitePatternHolder<test_suite_name>( \
482 GTEST_STRINGIFY_(test_suite_name), \
483 ::testing::internal::CodeLocation(__FILE__, __LINE__)) \
484 ->AddTestSuiteInstantiation( \
485 GTEST_STRINGIFY_(prefix), \
486 >est_##prefix##test_suite_name##_EvalGenerator_, \
487 >est_##prefix##test_suite_name##_EvalGenerateName_, \
488 __FILE__, __LINE__)
489
490
491 // Allow Marking a Parameterized test class as not needing to be instantiated.
492 #define GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(T) \
493 namespace gtest_do_not_use_outside_namespace_scope {} \
494 static const ::testing::internal::MarkAsIgnored gtest_allow_ignore_##T( \
495 GTEST_STRINGIFY_(T))
496
497 // Legacy API is deprecated but still available
498 #ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
499 #define INSTANTIATE_TEST_CASE_P \
500 static_assert(::testing::internal::InstantiateTestCase_P_IsDeprecated(), \
501 ""); \
502 INSTANTIATE_TEST_SUITE_P
503 #endif // GTEST_REMOVE_LEGACY_TEST_CASEAPI_
504
505 } // namespace testing
506
507 #endif // GOOGLETEST_INCLUDE_GTEST_GTEST_PARAM_TEST_H_
508